.STL Ring Model Wall Thickness Modification

I need a professional to modify the wall thickness of my .stl ring model. Currently, the walls are between 1-2 mm thick. I want the walls to be as thin as possible, while still being castable. The ring will be cast in silver, so the modified model should take into account the properties of this material. The goal is to achieve a wax model with .30 DWT of weight or less. The ring is a replica of an old ring that was made with a very thin lightweight metal.

Ideal skills for this job:
- Proficiency in 3D modeling software (like CAD)
- Experience with .stl file modification
- Knowledge of material properties, particularly for silver
- Understanding of casting process and requirements
- Attention to detail and precision in work